南海西部近海大中型油气田勘探新进展与思考  

New exploration progress and thinking of offshore large-medium-sized oil and gas fields in the western South China Sea

作　　者：徐长贵 范彩伟 XU Changgui;FAN Caiwei(CNOOC China Limited,Hainan Branch,Haikou,Hainan 570312,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312

出　　处：《中国海上油气》2021年第2期13-25,共13页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“近海大中型油气田形成条件及勘探技术(三期)(编号:2016ZX05024)”;“海洋深水区油气勘探关键技术(三期)(编号:2016ZX05026)”部分研究成果。

摘　　要：近年来,随着勘探程度提高,南海西部近海盆地勘探难度增大,大中型油气田勘探未获大的突破。2020年,通过解放思想、转变思路、创新认识,转向领域勘探,在珠江口盆地西部增压型断裂转换带、涠西南凹陷流一段湖底扇、琼东南深水梅山组海底扇等多个领域获得勘探突破。通过对南海西部近海盆地主要凹陷油气资源潜力和勘探阶段及其分布不均衡性的分析,以及对已发现大中型油气田分布与生烃强度、构造背景、裂隙(断裂)之间关系的研究,认为南海西部近海仍然具备寻找大中型油气田的广阔前景,提出了必须走领域突破之路,明确了大中型油气田勘探必须围绕六大富烃凹陷展开,天然气勘探要优先突破莺-琼盆地的高强度生气中心-优势汇聚背景-垂向裂隙带三元耦合区,原油勘探必须紧抓珠江口西部和北部湾断陷盆地的大型增压型断裂转换带和具有隆起背景的近源构造-岩性复合圈闭群。In recent years,with the increase of exploration degree,the exploration difficulty of offshore basin in the western South China Sea has increased,and the exploration of large-medium-sized oil and gas fields has not made a big breakthrough.In 2020,through emancipating the mind,changing the thinking and innovating the understanding,we turned to the field exploration,and made exploration breakthroughs in many fields,such as the pressurized fault transition zone in the western Pearl River Mouth Basin,the sublacustrine fan of the first member of Liushagang Formation in Weixinan sag,and the submarine fan of Meishan Formation in Qiongdongnan deep-water.Through analysis of the potential,exploration stage and uneven distribution of oil and gas resources in the main sags in the offshore basins of the western South China Sea,as well as the research on the relationship between the distribution of large-medium-sized oil and gas fields and hydrocarbon generation intensity,structural settings and fractures(faults),it is concluded that the offshore basins in the western South China Sea still have a broad prospect for the exploration of large and medium-sized oil and gas fields,and the way to make breakthroughs in field is proposed.It is made clear that the exploration of large-medium-sized oil and gas fields must focus on the six hydrocarbon rich depressions,and natural gas exploration should first break through the ternary coupling area of high-intensity gas generation center,dominant convergence background and vertical fracture zone in Ying-Qiong basin,while crude oil exploration must pay close attention to the large-scale pressurized fault transition zone in western Pearl River Mouth and Beibuwan fault depression basins and the near source structural-lithologic complex trap group with uplift background.

关 键 词：南海西部近海 大中型油气田 勘探突破 断裂转换带 湖底扇 海底扇 

分 类 号：TE122.1[石油与天然气工程—油气勘探]